This project is about an Attiny85-based word clock. The underlying kit can be purchased at https://shop.cyntech.co.uk/products/wordclock-kit.
While the original kit is built around a Raspberry Pi, I wanted to use an Adafruit Trinket and a DS3231 RTC instead. The Raspberry Pi just seemed to be overkill.
The source is based on the project of Andy Doro: https://github.com/andydoro/WordClock-NeoMatrix8x8
I've had to heavily modify the code to fit it within 5 KB of Flash and 512 bytes of RAM.
- Trinket 5V
- DS3231 RTC breakout (or similar)
- Wordclock kit 8x8
- A switch to select the color mode (optional)
- 3D print the STL in the 3dmodels/ folder
- 4 M3x15 screws
- Connect SDA and SCL of the RTC to the Trinket pins 0 and 2 respectively, VCC to the 5V pin
- DIN of the RGB matrix goes to pin 1
- 5VIN of the RGB matrix goes to the USB pin
- optional: a switch between pin 3 and GND
This code requires the following libraries: